Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8ed754a424e182…

MALICIOUS

PDF

102.3 KB Created: 2020-04-06 03:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d66fd3572e81932a81fb9254afb0ca1f SHA-1: 15616a4d3e77b38265a0cdf78731b61d44502534 SHA-256: bf8ed754a424e18231dd9847c43001b854898323abcc34dc623ebd58b037f3e5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious and indicative of a malicious distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://maenad-films.com/uploads/1/3/0/4/130479044/130479044.html#diferencie+teoria+finalista+e+maximalista+no+cdc
    • http://lawtonfirstnaz.com/uploads/1/3/1/3/131398143/xijagemezaxemusiwa.pdf
    • http://naturalhorsemanshipcentre.com/uploads/1/3/0/5/130588997/siketuredo.pdf
    • http://jensklein.dk/uploads/1/3/0/6/130639227/37f37c8922.pdf
    • http://pglconstruction.com/uploads/1/3/0/7/130776611/pudubogozati_mivulup_todut.pdf
    • http://estheaprague.com/uploads/1/3/0/6/130604682/kadavatugofe_dimuxuzobetij.pdf
    • http://bsdpd.com/uploads/1/3/0/9/130970023/wexipowuzuzosawikofo.pdf
    • http://charmaccents.com/uploads/1/3/0/3/130313323/nebut.pdf
    • http://gofhsfalcons.com/uploads/1/3/0/9/130969810/bofuserasezuzata.pdf
    • http://jllcapitalmarketseastonoval.com/uploads/1/3/0/4/130488662/4a2c6641c7ef.pdf
    • http://pcm-healthandfitness.com/uploads/1/3/0/6/130620906/29fb5b.pdf
    • http://bokstem.com/uploads/1/3/0/7/130776885/7637777.pdf
    • http://74-123-79-76.mgwnet.com/uploads/1/3/0/7/130739933/4e507a2ab6.pdf
    • http://manalokris3d.com/uploads/1/3/0/6/130603861/96af15d.pdf
    • http://takasshoetique.net/uploads/1/3/0/6/130620563/kanavojorud.pdf
    • http://kidsanimalsplants.com/uploads/1/3/0/9/130970012/35101.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160d4.bin
e28e12b322de3b697d5e8d1e3d4733fb2eaf532b598c7e3382f8b1a0294e6cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160D4 12708 bytes

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